We all have the responsibility to make our own decisions. Guys that get too cocky about their safety when diving are those that don't ever come back up on their own. You can use both for decompression dives, but in the manual it hints that you shouldn't do "planned deco" dives with it. Its more as an aid for when you screw up.
That simply is not Suunto's position per their own statements on their web page.
ALL decompression computers and dive planning software states that doing decompression dives are "not recommended."
Never mind that this is a cute fallacy; all dives are in fact decompression dives - for dives inside the NDL, you are just doing your decompression on the surface. It would be more accurate (and honest) to say that dives within an overhead, whether that overhead is a hard object or mandated by a decompression obligation, carry additional risk as the option of a direct surface ascent is not available if there is a failure of either equipment or human durnig the dive.
This is what VPlanner says on EVERY dive-planning screen:
********* WARNING & DISCLAIMER *********
This V-Planner generated dive schedule could indirectly kill you.
The author does not warrant that it accurately reflects the Varying
Permeability Model algorithms, that it won't get you bent or dead, or that it
will produce safe, reliable results. This dive schedule is experimental
and you use it at your own risk. Diving in general is fraught with
risk, and decompression diving adds significantly more risk.
Deep diving utilizing multiple gasses, including Helium, is about
as risky as it gets.
That does not change the fact that VPlanner is DESIGNED for decompression diving, just as Suunto says that their computers are "full decompression computers."
(This is in direct contrast to computers like the Genesis React, which give you what looks more like PADI's "oh darn I screwed up" type of recommendations on deco procedures if you exceed the NDL.)